Convert mustash use surface references.

services/ui/ws/window_server.cc

Index: services/ui/ws/window_server.cc
diff --git a/services/ui/ws/window_server.cc b/services/ui/ws/window_server.cc
index 3ab93974429d3dd07a6b98a31f7f031f92c3a086..ebd69455e78894410e5b813e74725af54ed239ff 100644
--- a/services/ui/ws/window_server.cc
+++ b/services/ui/ws/window_server.cc
@@ -774,6 +774,13 @@ void WindowServer::OnSurfaceCreated(const cc::SurfaceId& surface_id,
   window->GetOrCreateCompositorFrameSinkManager()->SetLatestSurfaceInfo(
       compositor_frame_sink_type, surface_id, frame_size);
 
+  // FrameGenerator will add an appropriate reference for the new surface.
+  DCHECK(display_manager_->GetDisplayContaining(window));
+  display_manager_->GetDisplayContaining(window)
+      ->platform_display()
+      ->GetFrameGenerator()
+      ->OnSurfaceCreated(surface_id, window);
+
   // This is only used for testing to observe that a window has a
   // CompositorFrame.
   if (!window_paint_callback_.is_null())